Rplcmnt, 50 HZ IM
   NOTE:  FOR INTERNATIONAL UNITS ONLY
   I601F  Use Prior to Serial #2631361
          Starting With Serial#2631361 See 7002797
   I661   See 7002797
   I632   Use Prior to Serial #2648771
          Starting With Serial#2648771 See 7002797
   I642   Use Prior to Serial #2646995
          Starting With Serial#2646995 See 7002797